From 94bf994b3714cb0c9fff0fe34e1dae934112710e Mon Sep 17 00:00:00 2001 From: Alex Williamson Date: Fri, 13 Apr 2007 08:33:21 -0600 Subject: [PATCH] [IA64] Fix ptc.ga emulation ptc.ga infrequently clobbers the region register 0. When vcpu1 purges TLBs of vcpu2 and ptc_ga_remote_func() is called locally not via IPI (i.e. vcpu1 shares the same pcpu with vcpu2), in ptc_ga_remote_func(), save vrr[0] of vcpu2 ... => switch to vcpu2 and set a new value of vrr[0] restore vrr[0] of vcpu2 // the new value is lost Windows will crash due to this issue. Signed-off-by: Kouya Shimura --- xen/arch/ia64/vmx/vmmu.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/xen/arch/ia64/vmx/vmmu.c b/xen/arch/ia64/vmx/vmmu.c index 3901fbae78..bf7f8f4c31 100644 --- a/xen/arch/ia64/vmx/vmmu.c +++ b/xen/arch/ia64/vmx/vmmu.c @@ -34,6 +34,7 @@ #include #include #include +#include /* * Get the machine page frame number in 16KB unit @@ -613,8 +614,14 @@ again: /* Try again if VCPU has migrated. */ } else if (v == vcpu) { vmx_vcpu_ptc_l(v, va, ps); } else { - ptc_ga_remote_func(&args); - if (proc != v->processor) + vcpu_schedule_lock_irq(v); + proc = v->processor; + if (proc == vcpu->processor) + ptc_ga_remote_func(&args); + else + proc = INVALID_PROCESSOR; + vcpu_schedule_unlock_irq(v); + if (proc == INVALID_PROCESSOR) goto again; } } -- 2.30.2